Travelers in the Night Eps. 589 & 590: Defending Earth & Noctilucent Clouds

<p class="p1">Dr. Al Grauer hosts. Dr. Albert D. Grauer ( <a href= "https://twitter.com/Nmcanopus">@Nmcanopus</a> ) is an observational asteroid hunting astronomer. Dr. Grauer retired from the University of Arkansas at Little Rock in 2006. <a href= "http://travelersinthenight.org">travelersinthenight.org</a></p> <p class="p2"><span class="s1"><strong>Today's 2 topics:</strong></span></p> <p class="p3">- The International Asteroid Warning Network, or IWAN, has been established to link scientists who are discovering, monitoring, and physically characterizing potentially dangerous asteroids.</p> <p class="p3">- Noctilucent Clouds exist at more than 50 miles above the Earth's surface or about 4 times higher than the tops of the most intense tropical thunder storms.</p> <p class="p4"> </p> <p class="p3">We've added a new way to donate to 365 Days of Astronomy to support editing, hosting, and production costs.</p> <p class="p3">Just visit: <a href= "https://www.patreon.com/365DaysOfAstronomy">https://www.patreon.com/365DaysOfAstronomy</a> and donate as much as you can!</p> <p class="p3">Share the podcast with your friends and send the Patreon link to them too!</p> <p class="p3">Every bit helps! Thank you!</p> <p class="p3">------------------------------------</p> <p class="p1"><span class="s2">Do go visit <a href= "http://astrogear.spreadshirt.com/">http://astrogear.spreadshirt.com/</a> for co</span>ol Astronomy Cast and CosmoQuest t-shirts, coffee mugs and other awesomeness!</p> <p class="p1"><a href= "http://cosmoquest.org/Donate">http://cosmoquest.org/Donate</a> This show is made possible through your donations.</p> <p class="p1">Thank you! (Haven't donated? It's not too late! Just <a href="http://cosmoquest.org/Donate">click</a>!)</p> <p class="p3">The 365 Days of Astronomy Podcast is produced by Astrosphere New Media. <a href= "http://www.astrosphere.org/">http://www.astrosphere.org/</a></p> <p class="p5"><span class="s3">Visit us on the web at <a href= "http://365DaysOfAstronomy.org/"><span class= "s4">365DaysOfA